Hi John. Only recently have the larger resource companies pushed to employ aviation specific employee's. I know BHP have advertised last year for a principal adviser, the same with Chevron and Woodside albeit slightly different names for the positions. Most the positions required a minimum of a CPL which is a step in the right direction.
Up until this, the guys making the decisions, well in one case that I know of was a housing department manager who's entire aviation experience was founded on paxing... and that would explain the poor choice of aircraft